Injuries of this nature require fast evaluation and treatment. This is due to the fact that several factors effect how bad the injury can get. These factors include the type of grease, the amount of grease and the pressure it was injected with. One of the most important factors is the time between the injection and treatment, and considering it could be surgical if the condition is bad enough, I would recommend the patient gets examined and to take a visit to the emergency room immediately where they could diagnose and treat him properly and and promptly.